public class Testbankaccout {
        public static void main(String[] args) {
            BankAccout bank1 = new BankAccout();
            System.out.println(bank1.toString());
            System.out.println("after*********");
            bank1.deposit(1000);//存款 1000
            bank1.withdraw(199.1);//取款 800
            System.out.println(bank1.toString());
            bank1.setBalance(2000);//是否合理？
        }
    }

